Several effective and inexpensive products are available to the home mechanic looking to seal minor cracks and/or holes in cast iron engine blocks. The products listed here are among the simplest to use and have reputations for excellent quality and low cost.
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K&W Engine Block Sealer
K&W Engine Block Sealer can seal cracks and holes in both cast iron and aluminium engine blocks. Additionally, K&W Engine Block Sealer will seal leaks in radiators and heater cores made from a wide variety of materials. It is available online and from retail outlets. Approximate cost is £4.2.
JB Weld offers two products capable of sealing cracks in cast iron engine blocks. They are JB Weld and JB Weld Kwik Fast Repair. Both products are binary epoxy compounds that require mixing before use. JB Weld products are available online and through a variety of retail outlets. They sell for about £3.
Gunk Heavy Duty Engine Block Seal
Gunk Heavy Duty Engine Block Seal is a simple to use one step product capable of sealing engine block leaks, as well as radiator and heater core leaks. The product is compatible with all types of engine blocks. Gunk Heavy Duty Engine Block Seal can be purchased online or at retail outlets and sells for about £4.2.
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